Datums
Datums
Datums
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Geometric Dimensioning & Tolerancing (GD&T)<br />
Placement of datums<br />
‣ <strong>Datums</strong> are generally placed on a feature, a centerline,<br />
or a plane depending on how dimensions need to be<br />
referenced.<br />
A<br />
OR<br />
A<br />
A<br />
ANSI 1982<br />
ASME 1994<br />
Line up with arrow only when<br />
the feature is a feature of<br />
size and is being defined as<br />
the datum
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